Presentation | 2008-03-05 Throughput Performance of Random-Access Wireless System with Pre-FFT Type MMSE Adaptive Array Antenna Kazuto YANO, Ikuo HIRADATE, Satoshi TSUKAMOTO, Makoto TAROMARU, |
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Abstract(in Japanese) | (See Japanese page) |
Abstract(in English) | Both increasing the chances of frame transmission by raising carrier sense level and the suppressing asynchronous interference signals are the requirements for a significant enhancement of the area-spectral efficiency of random-access wireless systems based on CSMA/CA. Recently, the authors have proposed a pre-FFT type MMSE adaptive array antenna with iterative weight update for OFDM systems in order to suppress asynchronous interference effectively. They have also constructed a multi-node link-level simulation tool based on the IEEE 802.11g ERP-OFDM system in order to evaluate the area-spectral efficiency of the random-access wireless system. It includes basic MAC layer processes of the DCF mode and a method of generating multipath channels among multiple nodes using 2-D raytracing simulations considering only transmission and reflection at walls. In this paper, the area-spectral efficiency enhancement of a random-access wireless system is evaluated through computer simulations assuming an indoor environment in which there is an LOS path only between nodes communicating each other. Simulation results show that a significant enhancement of the area-spectral efficiency can be achieved by disabling carrier sensing processes. It is also revealed that both a further enhancement of the area-spectral efficiency and an improvement of fairness can be brought by introducing the proposed adaptive array antenna to all nodes if a high transmission datarate is used. |
Keyword(in Japanese) | (See Japanese page) |
Keyword(in English) | pre-FFT type adaptive array antenna / area-spectral efficiency / random access system / IEEE 802.11g / indoor environment / OFDM |
Paper # | RCS2007-199 |
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Committee | RCS |
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Conference Date | 2008/2/27(1days) |
Place (in Japanese) | (See Japanese page) |
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Registration To | Radio Communication Systems (RCS) |
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Language | JPN |
Title (in Japanese) | (See Japanese page) |
Sub Title (in Japanese) | (See Japanese page) |
Title (in English) | Throughput Performance of Random-Access Wireless System with Pre-FFT Type MMSE Adaptive Array Antenna |
Sub Title (in English) | |
Keyword(1) | pre-FFT type adaptive array antenna |
Keyword(2) | area-spectral efficiency |
Keyword(3) | random access system |
Keyword(4) | IEEE 802.11g |
Keyword(5) | indoor environment |
Keyword(6) | OFDM |
1st Author's Name | Kazuto YANO |
1st Author's Affiliation | ATR Wave Engineering Laboratories() |
2nd Author's Name | Ikuo HIRADATE |
2nd Author's Affiliation | ATR Wave Engineering Laboratories |
3rd Author's Name | Satoshi TSUKAMOTO |
3rd Author's Affiliation | ATR Wave Engineering Laboratories |
4th Author's Name | Makoto TAROMARU |
4th Author's Affiliation | ATR Wave Engineering Laboratories |
Date | 2008-03-05 |
Paper # | RCS2007-199 |
Volume (vol) | vol.107 |
Number (no) | 518 |
Page | pp.pp.- |
#Pages | 6 |
Date of Issue |